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        <h2 id="写在前面："><a href="#写在前面：" class="headerlink" title="写在前面："></a>写在前面：</h2><p>这篇文章是本人学习过程中遇到css的零碎知识点2（就是以前自己不知道的），我都记下来了，需要的朋友可以过来参考下，喜欢的可以点个赞，希望对大家有所帮助。<strong>本文的受众是前端小白，大手子可以跳过。</strong></p>
<h3 id="1-scss编译css文件使用中文注释出现乱码："><a href="#1-scss编译css文件使用中文注释出现乱码：" class="headerlink" title="1.scss编译css文件使用中文注释出现乱码："></a>1.scss编译css文件使用中文注释出现乱码：</h3><p><img src="https://dn-mhke0kuv.qbox.me/428897e0e0f518229d87" alt=""></p>
<h4 id="在文件开头部分加上：-charset-“UTF-8”"><a href="#在文件开头部分加上：-charset-“UTF-8”" class="headerlink" title="在文件开头部分加上：@charset “UTF-8”;"></a>在文件开头部分加上：@charset “UTF-8”;</h4><p><strong>注意：</strong>这里必须要加在文件开头部分，加在文件中部和结尾部分是无效的。</p>
<hr>
<h3 id="2-HTML-input标签的-maxlength-属性"><a href="#2-HTML-input标签的-maxlength-属性" class="headerlink" title="2.HTML input标签的 maxlength 属性"></a>2.HTML input标签的 maxlength 属性</h3><h4 id="定义和用法："><a href="#定义和用法：" class="headerlink" title="定义和用法："></a>定义和用法：</h4><p>maxlength 属性规定<strong>输入字段的最大长度</strong>，以字符个数计。<br>maxlength 属性与 input type=”text” 或 input type=”password” 配合使用。</p>
<h2 id="注意："><a href="#注意：" class="headerlink" title="注意："></a>注意：</h2><p><del>这里所说的以字符个数计算，中文是占两个字符，字母和数字都是占一个字符，但是我实际使用过程中，input里面<strong>无论中文，英文字母，数字</strong>，都可以输入<strong>相同长度</strong>，也就是说这是一个bug？？？</del></p>
<p><img src="https://dn-mhke0kuv.qbox.me/bfbe366aca62322e9c6e" alt="我知道没有图你们是不会信的"></p>
<p><img src="https://dn-mhke0kuv.qbox.me/a9ab1b62da1421aa4596" alt=""></p>
<p>上面是我先前的理解，经过评论区朋友的指点，发现原先的理解事错的，回来更正一下。</p>
<p><strong>字节不等同于字符，字节不等同于字符，字节不等同于字符，</strong></p>
<h4 id="汉字占两个字节，但是只占了一个字符，所以属性没毛病，是我之前理解错了"><a href="#汉字占两个字节，但是只占了一个字符，所以属性没毛病，是我之前理解错了" class="headerlink" title="汉字占两个字节，但是只占了一个字符，所以属性没毛病，是我之前理解错了"></a>汉字占两个字节，但是只占了一个字符，所以属性没毛病，是我之前理解错了</h4><p>这里有一个用JS限制文本框所输入字符串的最大字节数的办法有兴趣可以看一下：<a href="http://blog.sina.com.cn/s/blog_815611fb0101jkah.html" target="_blank" rel="noopener">http://blog.sina.com.cn/s/blog_815611fb0101jkah.html</a></p>
<p>ps：其实我也不知道有什么用，可能有些场景对这些规定的比较死，才能用的到，你们就蛮看一下。。</p>
<hr>
<h3 id="3-背景图片如何居中："><a href="#3-背景图片如何居中：" class="headerlink" title="3.背景图片如何居中："></a>3.背景图片如何居中：</h3><p>background：url center no-repeat；只要在这里加个center就可以使背景图片垂直水平居中了</p>
<p><img src="https://dn-mhke0kuv.qbox.me/82d5accda1696d48355a" alt=""></p>
<p>实际上这里是用了 <strong>background-position</strong>属性。</p>
<h4 id="background-position定义和用法"><a href="#background-position定义和用法" class="headerlink" title="background-position定义和用法"></a>background-position定义和用法</h4><p><img src="https://dn-mhke0kuv.qbox.me/1b676858cbca83c8e902" alt="太多了，放个图片自己看一看。"></p>
<h3 id="4-css样式最好不要把宽度定死了，这样会导致页面缩小的时候超出范围。"><a href="#4-css样式最好不要把宽度定死了，这样会导致页面缩小的时候超出范围。" class="headerlink" title="4.css样式最好不要把宽度定死了，这样会导致页面缩小的时候超出范围。"></a>4.css样式最好不要把宽度定死了，这样会导致页面缩小的时候超出范围。</h3><p>这个问题太low，我就不放栗子了。</p>
<p>说明：当你某个div或者head，body哪里宽度定死了之后，查看手机自适应的时候，就很容易出现横向滚动条，是因为页面缩小之后，你<strong>宽度定死的那个部分没有跟随其他部分按照相同比例缩小</strong>，虽然那个部分也是缩小了，但是缩小的比例不对。</p>
<hr>
<h3 id="5-字体间距"><a href="#5-字体间距" class="headerlink" title="5.字体间距"></a>5.字体间距</h3><p>letter-spacing</p>
<p>所有浏览器都支持 letter-spacing 属性。</p>
<p><img src="https://dn-mhke0kuv.qbox.me/7fbf9ab532614cf41346" alt=""></p>
<p>蛮看一下，稍微记下，这个还是蛮偏的</p>
<p><strong>使用场景：</strong>有时候留白部分太多，看起来空空荡荡的，或者字体过小，不易阅读，此时可以使用这个属性。<strong>允许使用负值</strong>，有时候字体之间的距离也会更大，这时使用负值会让字母之间挤得更紧。</p>
<h2 id="后话："><a href="#后话：" class="headerlink" title=" 后话："></a> 后话：</h2><p>先记这些，以后学到了新的东西，累积起来，再发一些，这些都是我写页面期间遇到的问题，再次强调一下是写给小白看的，让他们以后少踩些坑，小白们也多点参考资料。</p>
<p><strong>最后：</strong>希望看完的朋友点个喜欢，也可以关注一下我，现在这阶段基本上每个月都不会少于十五篇文章（看到干货我也会进行分享）。码字不易，感谢支持，感激不尽！<br><strong>ps</strong>：目前待业，坐标北京，求推荐工作。然后希望我写哪方面的文章可以在底下评论，或者是私信我，虽然写的不好，但我就当这是记录自己成长的一种方式咯。（前提是我会了，如果不会我也会记下来，等会了的时候再更出来。）<br><a href="http://www.jianshu.com/u/8d1dd8c80f06" target="_blank" rel="noopener"></a><strong><a href="https://juejin.im/user/58714f0eb123db4a2eb95372" target="_blank" rel="noopener">掘金个人主页</a>  ，</strong><a href="http://www.jianshu.com/u/8d1dd8c80f06" target="_blank" rel="noopener"><strong>简书主页链接</strong></a>，<strong><a href="http://blog.csdn.net/OBKoro1?skin=dark1" target="_blank" rel="noopener">csdn博客主页链接</a> ，<a href="https://github.com/OBKoro1" target="_blank" rel="noopener">github</a> 。</strong></p>
<p>以上。2017.4.14.</p>

      
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